CA4 and cancer: Remarkably, CA4 amplification was obviously related to better PFS (KIRC: hazard ratio [HR] = 0.661, p < 0.001; LGG: HR = 0.552, p = 0.002; LUAD: HR = 0.922, p = 0.020; UVM: HR = 0.454, p = 0.001) and better OS (KIRC: HR = 0.847, p < 0.001; LGG: HR = 0.552, p < 0.001; LUAD: HR = 0.918, p = 0.007; UVM: HR = 0.454, p < 0.001) in all of these four cancers.